244 ポリ(L-乳酸)の降伏応力に与えるひずみ速度の影響(生体・環境適合型材料の創製と特性評価(3),ものづくりにおける基礎研究と先端技術の融合)

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The compressive and tensile properties of poly(L-lactic acid) (PLLA) were measured using a universal testing machine and the influence of strain rate on the compressive properties of PLLA were examined using a split Hopkinson pressure bar method. We determined constants of Drucker-Prager yield criterion for PLLA, and drew the yield curves in the plane stress space and in the second deviatoric stress invariant-first invariant of stress. The compressive yield stress of PLLA increased with an increase in the strain rate, but PLLA caused the brittle fracture in the dynamic compressive examination.
2010-11-27